Brake-shoe-burnishing machine



91- 1930. s. WHITWORTH 1,775,710

BRAKE SHOE BURNISHING MACHINE Filed June '20. 1927 2 Sheets-Sheet 1 1 l A? .56 g i Q INVENTOR ATTORNEY Sept. 16, 1930. 5, w rrw 1,775,710

BRAKE SHOE BURNISHING MACHINE Filed June 20, 1927 2 Sheets-Sheet 2 Ill W//// III H616 INVENTOR STANLEY WHITWORTH ATTORNEY Patented Sept. 16, 1930 UNITED STATES PATENT OFFICE STANLEY WHITWORTH, OF SOUTH BEND, INDIANA, ASSIGNOR 'I'O BENDIX BRAKE COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS BRA KE-SHOE-IBURNISHING MACHINE Application filed. June 20,

; ing forced against an internally-cylindrical surface on a rotating member, which member in the illustrated machine is quite heavy so that its inertia will prevent it from slowing up materially when a shoe is forced against Itis convenient to arrange the support which carries the shoe, with its friction surface unobstructed for engagement with the rotating member, in such a manner that it moves the shoe from a loading position outside the recess in the rotating member to a position inside that recess, andthen outward- 1y into burnishing engagement with the internally-cylindrical surface of the rotating member. Various important features of novelty relate to the means'for moving the shoe in this manner.

The above and other objects and features of the invention will be apparent from the following description of one illustrative embodiment shown in the accompanying drawings, in which: v

Figure 1 is atop plan view of the novel machine;

Figure 2 is a side elevation of the machine;

Figure 3 is a front elevation of the machine, shown burnishing a primary shoe for a threeshoe automobile brake;

Figure 4 is'a view corresponding to part .of

Figure 6 is a partial section on the line 66 of Figure 3, showing part of the operating means connected to the pedal;

Figure 3, butshowing the machineburnish- 1927. Serial a... 199,977.

of Figure 3, showing part of the toggle means operated by the pedal; and

Figure 8 is a partial section on the line 88 ofFigure 3, showing the mounting of the shoe support.

The illustrated machine comprises generally a base 10 supporting a suitable bench or table 12, on which is mounted an electric motor or the like 14. Motor 14 drives, through a chain or other gearing 16, preferably having a guard 18, a shaft 20 supported in suitable lubricated bearings 22 and 24, and having at its end a novel rotating member 26.

' Member 26 is quite heavy, so that it has a Very considerable inertia, and is shown protected by a housing 28. Air jets 30 may be provided if desired.

According to an important feature of the invention, member 26 is formed on its outer side with a recess 32, thus providing an internally-cylindrical surface simulating a brake drum, and against which the shoes are forced to burnish them. Member 26 is preferably of cast iron, but may be of other material if desired.

The operating mechanism for forcing the shoes against the burn-ishing surface includes a pedal or the like 34, controlled by the operatorfs foot, and connected, by a pair of members 36 riveted together to form a link, to the knuckle of a toggle consisting of a link 38 pivoted at 40 to the machine frame, and a pair of links 42 connected by a pivot 44 to the lower end of a lever 46 pivoted on the machine frame at 48. The above-described toggle forms foot-controlled power-multiplying means for operating lever 46.

A second lever 50, carrying a removable brake-shoe supporting fixture 52, is connected to lever 46 by a pivot 54 at right angles to the pivot 48. Lever 50 is operable by the operators hand. Fixtures 52 of diflerent kinds are provided for different kinds of brake shoes, as for example the primary shoe S shown in Figure 3 or the secondary shoe 8' shown in Figure 4.

In operation, lever 50 is swung away from member 26, a shoe is placed on the fixture 5'2, p

and the operator then swings the lever 50 to Figure7 is apartialsection on the line 7-7 carry the shoe inside of the recess 32. The

7 action.

depression of pedal 34 then swings lever 46 in a very powerful manner, to force the friction surfaceof the shoe S or S against the burnishing surface of member 26. It will be noted that the fixture 52 holds the shoe with its friction surface entirely unobstructed, to permit the described burnishing When the pedal 34 is released, a return spring 58 moves the shoe away from the burnishing surface. The operator swings the lever 50 outwardly with one hand and removes the burnished shoe with the other hand, whereupon another shoe is placed on the fixture 52 for the next cycle of operations.

While one machinehas been described in detail, it is not my intention to limit the scope of the invention to that particular machine, or otherwise than by the terms of the appended claims.

I claim:

1. A machine comprising, in combination, a rotating operating device, a pedal below said device, a toggle mounted on a fixed pivot at one end and having its knuckle connected to the pedal, a bell-crank lever operatively connected to the other end of the toggle, and a work-carrier mounted on the bellcrank lever by a pivot for swinging movement at right angles to the movement caused by the pedal, the movement of said carrier bringing the work into operative position with respect to said device and the pedal serving to press the work against said device.

2. A machine comprising, in combination,- a rotating operating device, a pedal below said device, power-multiplying means connected to the pedal, a bell-crank lever operatively connected to said means, and a workcarrier mounted on the bellcrank lever by a pivot for swinging movement at right angles to the movement caused by the pedal, the movement of said carrier bringing the work into operative position with respect to said device and the pedal serving to press the work against said device.

3. A machine comprising, in combination, a rotatable operating device, a lever below said device, a toggle mounted below said device and having its knuckle connected to 'the lever, a second lever operatively connected to one end of the toggle, the Work carrier mounted onsaid last-mentioned lever having swinging'movement at right angles to the movement caused by the movement of said firstmentione'd lever, the movement of said carri er bringing the work into operative position with respect to said device and said first-mentioned lever serving to press the work against said device.

4. A machine comprising, in combination, a rotatable operating device, a lever below said device, a toggle mounted below said device and having its knuckle connected to said lever so that the same operates as a lever said of the second class, a support operatively connected to said toggle, said support carrying a work carrier mounted for swinging movement at right angles to the movement caused by the first-mentioned level, the movement of said carrier bringing the work into operativefiposition with respect to said device and rst-mentioned lever serving to press the Work against said device.

In testimony whereof, I have hereunto signed my name.

STANLEY WHITWORTI-I. 

